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Comparing deliantra/Deliantra-Client/DC/DB.pm (file contents):
Revision 1.25 by root, Tue Dec 11 03:38:36 2007 UTC vs.
Revision 1.45 by root, Sat Apr 3 02:58:24 2010 UTC

1=head1 NAME 1=head1 NAME
2 2
3CFPlus::DB - async. database and filesystem access for cfplus 3DC::DB - async. database and filesystem access for deliantra
4 4
5=head1 SYNOPSIS 5=head1 SYNOPSIS
6 6
7 use CFPlus::DB; 7 use DC::DB;
8 8
9=head1 DESCRIPTION 9=head1 DESCRIPTION
10 10
11=over 4 11=over 4
12 12
13=cut 13=cut
14 14
15package CFPlus::DB; 15package DC::DB;
16 16
17use strict; 17use common::sense;
18use utf8;
19 18
19use File::Path ();
20use Carp (); 20use Carp ();
21use Storable (); 21use Storable ();
22use AnyEvent::Util ();
22use Config; 23use Config;
23use BDB; 24use BDB;
25use Fcntl ();
24 26
25use CFPlus; 27use DC;
26 28
27our $DB_HOME = "$Crossfire::VARDIR/cfplus-" . BDB::VERSION . "-$Config{archname}"; 29our $ODBDIR = "cfplus-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
30our $DBDIR = "client-" . BDB::VERSION_MAJOR . "." . BDB::VERSION_MINOR . "-$Config{archname}";
31our $DB_HOME = "$Deliantra::VARDIR/$DBDIR";
32
33sub FIRST_TILE_ID () { 64 }
34
35unless (-d $DB_HOME) {
36 if (-d "$Deliantra::VARDIR/$ODBDIR") {
37 rename "$Deliantra::VARDIR/$ODBDIR", $DB_HOME;
38 print STDERR "INFO: moved old database from $Deliantra::VARDIR/$ODBDIR to $DB_HOME\n";
39 } elsif (-d "$Deliantra::OLDDIR/$ODBDIR") {
40 rename "$Deliantra::OLDDIR/$DBDIR", $DB_HOME;
41 print STDERR "INFO: moved old database from $Deliantra::OLDDIR/$ODBDIR to $DB_HOME\n";
42 } else {
43 File::Path::mkpath [$DB_HOME]
44 or die "unable to create database directory $DB_HOME: $!";
45 }
46}
47
48BDB::max_poll_time 0.03;
49BDB::max_parallel 1;
28 50
29our $DB_ENV; 51our $DB_ENV;
52our $DB_ENV_FH;
30our $DB_STATE; 53our $DB_STATE;
31our %DB_TABLE; 54our %DB_TABLE;
55our $TILE_SEQ;
32 56
57sub all_databases {
58 opendir my $fh, $DB_HOME
59 or return;
60
61 grep !/^(?:\.|log\.|_)/, readdir $fh
62}
63
64sub try_verify_env($) {
65 my ($env) = @_;
66
67 open my $lock, "+>$DB_HOME/__lock"
68 or die "__lock: $!";
69
70 flock $lock, &Fcntl::LOCK_EX
71 or die "flock: $!";
72
73 # we look at the __db.register env file that has been created by now
74 # and check for the number of registered processes - if there is
75 # only one, we verify all databases, otherwise we skip this
76 # we MUST NOT close the filehandle as longa swe keep the env open, as
77 # this destroys the record locks on it.
78 open $DB_ENV_FH, "<$DB_HOME/__db.register"
79 or die "__db.register: $!";
80
81 # __db.register contains one record per process, with X signifying
82 # empty records (of course, this is completely private to bdb...)
83 my $count = grep /^[^X]/, <$DB_ENV_FH>;
84
85 if ($count == 1) {
86 # if any databases are corrupted, we simply delete all of them
87
88 for (all_databases) {
89 my $dbh = db_create $env
90 or last;
91
92 # a failed verify will panic the environment, which is fine with us
93 db_verify $dbh, "$DB_HOME/$_";
94
95 return if $!; # nuke database and recreate if verification failure
96 }
97
98 }
99
100 # close probably cleans those up, but we also want to run on windows,
101 # so better be safe.
102 flock $lock, &Fcntl::LOCK_UN
103 or die "funlock: $!";
104
105 1
106}
107
33sub open_db { 108sub try_open_db {
34 mkdir $DB_HOME, 0777; 109 File::Path::mkpath [$DB_HOME];
35 110
111 undef $DB_ENV;
112 undef $DB_ENV_FH;
113
36 $DB_ENV = db_env_create; 114 my $env = db_env_create;
37 115
38 $DB_ENV->set_errfile (\*STDERR); 116 $env->set_errfile (\*STDERR);
39 $DB_ENV->set_msgfile (\*STDERR); 117 $env->set_msgfile (\*STDERR);
40 $DB_ENV->set_verbose (-1, 1); 118 $env->set_verbose (-1, 1);
41 119
42 $DB_ENV->set_flags (BDB::AUTO_COMMIT | BDB::LOG_AUTOREMOVE | BDB::TXN_WRITE_NOSYNC); 120 $env->set_flags (BDB::AUTO_COMMIT | BDB::REGION_INIT);
121 $env->set_flags (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7;
122 $env->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7;
123
124 $env->set_timeout (3, BDB::SET_TXN_TIMEOUT);
125 $env->set_timeout (3, BDB::SET_LOCK_TIMEOUT);
126
43 $DB_ENV->set_cachesize (0, 2048 * 1024, 0); 127 $env->set_cachesize (0, 2048 * 1024, 0);
44 128
45 db_env_open $DB_ENV, $DB_HOME, 129 db_env_open $env, $DB_HOME,
46 BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN, 130 BDB::CREATE | BDB::REGISTER | BDB::RECOVER | BDB::INIT_MPOOL | BDB::INIT_LOCK | BDB::INIT_TXN,
47 0666; 131 0666;
48 132
49 $! and die "cannot open database environment $DB_HOME: " . BDB::strerror; 133 $! and die "cannot open database environment $DB_HOME: " . BDB::strerror;
134
135 # now we go through the registered processes, if there is only one, we verify all files
136 # to make sure windows didn'T corrupt them (as windows does....)
137 try_verify_env $env
138 or die "database environment failed verification";
139
140 $DB_ENV = $env;
50 141
51 1 142 1
52} 143}
53 144
54sub table($) { 145sub table($) {
55 $DB_TABLE{$_[0]} ||= do { 146 $DB_TABLE{$_[0]} ||= do {
56 my ($table) = @_; 147 my ($table) = @_;
57 148
58 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge; 149 $table =~ s/([^a-zA-Z0-9_\-])/sprintf "=%x=", ord $1/ge;
59 150
151 $DB_ENV#d#
152 or return ::clienterror ("trying to create table $_[0] with empty db_env $DB_ENV" => 1);#d#
153
60 my $db = db_create $DB_ENV; 154 my $db = db_create $DB_ENV;
61 $db->set_flags (BDB::CHKSUM); 155 $db->set_flags (BDB::CHKSUM);
62 156
63 db_open $db, undef, $table, undef, BDB::BTREE, 157 db_open $db, undef, $table, undef, BDB::BTREE,
64 BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666; 158 BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0666;
… …
69 } 163 }
70} 164}
71 165
72############################################################################# 166#############################################################################
73 167
74unless (eval { open_db }) { 168our $WATCHER;
75 warn "$@";#d# 169our $SYNC;
76 eval { File::Path::rmtree $DB_HOME };
77 open_db;
78}
79
80our $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
81
82our $SYNC = EV::timer_ns 0, 60, sub {
83 $_[0]->stop;
84 db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
85};
86
87our $tilemap; 170our $facemap;
88 171
89sub exists($$$) { 172sub exists($$$) {
90 my ($db, $key, $cb) = @_; 173 my ($db, $key, $cb) = @_;
91 174
92 my $data; 175 my $data;
… …
134 my ($name, $cb) = @_; 217 my ($name, $cb) = @_;
135 218
136 my $table = table "facemap"; 219 my $table = table "facemap";
137 my $id; 220 my $id;
138 221
139 db_get $table, undef, $name, $id, 0; 222 db_get $table, undef, $name => $id, 0;
140 return $cb->($id) unless $!; 223 $! or return $cb->($id);
141 224
142 for (1..100) { 225 unless ($TILE_SEQ) {
143 my $txn = $DB_ENV->txn_begin; 226 $TILE_SEQ = $table->sequence;
144 db_get $table, $txn, id => $id, 0; 227 $TILE_SEQ->initial_value (FIRST_TILE_ID);
228 $TILE_SEQ->set_cachesize (0);
229 db_sequence_open $TILE_SEQ, undef, "id", BDB::CREATE;
230 }
145 231
146 $id = 64 if $id < 64; 232 db_sequence_get $TILE_SEQ, undef, 1, my $id;
147 233
148 ++$id; 234 die "unable to allocate tile id: $!"
149 235 if $!;
150 db_put $table, $txn, id => $id, 0;
151 db_txn_finish $txn;
152
153 $SYNC->again unless $SYNC->is_active;
154
155 return $cb->($id) unless $!;
156
157 select undef, undef, undef, 0.01 * rand;
158 } 236
237 db_put $table, undef, $name => $id, 0;
238 $cb->($id);
159 239
160 die "maximum number of transaction retries reached - database problems?";
161} 240}
162 241
163sub get_tile_id_sync($) { 242sub get_tile_id_sync($) {
164 my ($name) = @_; 243 my ($name) = @_;
165 244
166 # fetch the full face table first
167 unless ($tilemap) {
168 do_table facemap => sub {
169 $tilemap = $_[0];
170 delete $tilemap->{id};
171 my %maptile = reverse %$tilemap;#d#
172 if ((scalar keys %$tilemap) != (scalar keys %maptile)) {#d#
173 $tilemap = { };#d#
174 CFPlus::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
175 }#d#
176 };
177 BDB::flush;
178 }
179
180 $tilemap->{$name} ||= do { 245 $facemap->{$name} ||= do {
181 my $id; 246 my $id;
182 do_get_tile_id $name, sub { 247 do_get_tile_id $name, sub {
183 $id = $_[0]; 248 $id = $_[0];
184 }; 249 };
185 BDB::flush; 250 BDB::flush;
… …
194 "$DB_HOME/res-data-" . unpack "H*", $_[0] 259 "$DB_HOME/res-data-" . unpack "H*", $_[0]
195} 260}
196 261
197sub sync { 262sub sync {
198 # for debugging 263 # for debugging
199 #CFPlus::DB::Server::req (sync => sub { }); 264 #DC::DB::Server::req (sync => sub { });
200 CFPlus::DB::Server::sync (); 265 DC::DB::Server::sync ();
201} 266}
202 267
203sub unlink($$) { 268sub unlink($$) {
204 CFPlus::DB::Server::req (unlink => @_); 269 DC::DB::Server::req (unlink => @_);
205} 270}
206 271
207sub read_file($$) { 272sub read_file($$) {
208 CFPlus::DB::Server::req (read_file => @_); 273 DC::DB::Server::req (read_file => @_);
209} 274}
210 275
211sub write_file($$$) { 276sub write_file($$$) {
212 CFPlus::DB::Server::req (write_file => @_); 277 DC::DB::Server::req (write_file => @_);
213} 278}
214 279
215sub prefetch_file($$$) { 280sub prefetch_file($$$) {
216 CFPlus::DB::Server::req (prefetch_file => @_); 281 DC::DB::Server::req (prefetch_file => @_);
217} 282}
218 283
219sub logprint($$$) { 284sub logprint($$$) {
220 CFPlus::DB::Server::req (logprint => @_); 285 DC::DB::Server::req (logprint => @_);
221} 286}
222 287
288#############################################################################
289
223package CFPlus::DB::Server; 290package DC::DB::Server;
224 291
225use strict; 292use common::sense;
226 293
227use EV (); 294use EV ();
228use Fcntl; 295use Fcntl;
229 296
230our %CB; 297our %CB;
… …
349 416
350 print { $LOG_FH{$path} } "$ts $line\n" 417 print { $LOG_FH{$path} } "$ts $line\n"
351} 418}
352 419
353sub run { 420sub run {
354 ($FH, my $fh) = CFPlus::socketpipe; 421 ($FH, my $fh) = AnyEvent::Util::portable_socketpair
422 or die "unable to create database socketpair: $!";
355 423
356 my $oldfh = select $FH; $| = 1; select $oldfh; 424 my $oldfh = select $FH; $| = 1; select $oldfh;
357 my $oldfh = select $fh; $| = 1; select $oldfh; 425 my $oldfh = select $fh; $| = 1; select $oldfh;
358 426
359 my $pid = fork; 427 my $pid = fork;
360 428
361 if (defined $pid && !$pid) { 429 if (defined $pid && !$pid) {
362 local $SIG{QUIT}; 430 local $SIG{QUIT} = "IGNORE";
363 local $SIG{__DIE__}; 431 local $SIG{__DIE__};
364 local $SIG{__WARN__}; 432 local $SIG{__WARN__};
365 eval { 433 eval {
366 close $FH; 434 close $FH;
367 435
… …
373 or die "unexpected eof while reading request"; 441 or die "unexpected eof while reading request";
374 442
375 $req = Storable::thaw $req; 443 $req = Storable::thaw $req;
376 444
377 my ($id, $type, @args) = @$req; 445 my ($id, $type, @args) = @$req;
378 my $cb = CFPlus::DB::Server->can ("do_$type") 446 my $cb = DC::DB::Server->can ("do_$type")
379 or die "$type: unknown database request type\n"; 447 or die "$type: unknown database request type\n";
380 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)]; 448 my $res = pack "N/a*", Storable::freeze [$id, $cb->(@args)];
381 (syswrite $fh, $res) == length $res 449 (syswrite $fh, $res) == length $res
382 or die "DB::write: $!"; 450 or die "DB::write: $!";
383 } 451 }
… …
390 }; 458 };
391 459
392 warn $error 460 warn $error
393 if $error; 461 if $error;
394 462
395 CFPlus::_exit 0; 463 DC::_exit 0;
396 } 464 }
397 465
398 close $fh; 466 close $fh;
399 CFPlus::fh_nonblocking $FH, 1; 467 DC::fh_nonblocking $FH, 1;
400 468
401 $CB{die} = sub { die shift }; 469 $CB{die} = sub { die shift };
402 470
403 $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read; 471 $fh_r_watcher = EV::io $FH, EV::READ , \&fh_read;
404 $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write; 472 $fh_w_watcher = EV::io $FH, EV::WRITE, \&fh_write;
… …
406 474
407sub stop { 475sub stop {
408 close $FH; 476 close $FH;
409} 477}
410 478
479package DC::DB;
480
481sub nuke_db {
482 undef $DB_ENV;
483 undef $DB_ENV_FH;
484
485 File::Path::mkpath [$DB_HOME];
486 eval { File::Path::rmtree $DB_HOME };
487}
488
489sub open_db {
490 unless (eval { try_open_db }) {
491 warn "$@";#d#
492 eval { nuke_db };
493 try_open_db;
494 }
495
496 # fetch the full face table first
497 unless ($facemap) {
498 do_table facemap => sub {
499 $facemap = $_[0];
500 delete $facemap->{id};
501 my %maptile = reverse %$facemap;#d#
502 if ((scalar keys %$facemap) != (scalar keys %maptile)) {#d#
503 $facemap = { };#d#
504 DC::error "FATAL: facemap is not a 1:1 mapping, please report this and delete your $DB_HOME directory!\n";#d#
505 }#d#
506 };
507 }
508
509 $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb;
510 $SYNC = EV::timer_ns 0, 60, sub {
511 $_[0]->stop;
512 db_env_txn_checkpoint $DB_ENV, 0, 0, 0, sub { };
513 };
514}
515
516END {
517 db_env_txn_checkpoint $DB_ENV, 0, 0, 0
518 if $DB_ENV;
519
520 undef $TILE_SEQ;
521 %DB_TABLE = ();
522 undef $DB_ENV;
523}
524
4111; 5251;
412 526
413=back 527=back
414 528
415=head1 AUTHOR 529=head1 AUTHOR

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